IText is not working properly when the Canvas is within a Bootstrap Modal

[superstar1128]

Version

3.6.0

Test Case

http://jsfiddle.net/tzjtr09h/

Information about environment

jquery, bootstrap, fabric.js

Steps to reproduce

When I create canvas on the modal, I can't type text into canvas.

Note

• I see similar reports with this, but can't find good solution.
• When I remove focus event from jquery, it could work well without any change on the fabric.js

[asturur]

The reports are identical, and there isn't a good solution.
If jquery swallow your keypresses, you can't do much other than modify fabricJS to have the hiddenTextarea inside the canvas container so that it is inside the modal also.
Until we support ie11 we can't do it.

[asturur]

probably solved with #7314